Lewis Short
ostrum (noun N) = ὄστρεον: .
* Lit., the blood of the sea-snail, purple (cf.: murex, purpura): ostro Perfusae vestes,Verg. A. 5, 111; Vitr. 7, 13.
* Transf.
* Stuff dyed with purple, a purple dress, purple covering, purple: textilibus si in picturis ostroque rubenti Jacteris,Lucr. 2, 35: stratoque super discumbitur ostro,on purple-covered couches,Verg. A. 1, 700: Sarrano dormire ostro,id. G. 2, 506: velare umeros ostro,id. A. 7, 814; 4, 134; Prop. 4 (5), 3, 51. cenae sine aulaeis et ostro,Hor. C. 3, 29, 15; id. Ep. 1, 10, 26.
* The brilliancy of purple, purple, Auct. Aetnae, 332.
Charlton T. Lewis, Charles Short, A Latin Dictionary